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Linux kernel source tree
eb9fcf6385
CHV is currently straddling the divide by using parse_ddi_ports() stuff for aux_ch/ddc_pin but going through all old codepaths for the rest (intel_bios_is_port_present(), intel_bios_is_port_edp(), intel_bios_is_port_dp_dual_mode()). Let's switch over full and use i915->vbt.ports[] for the rest of the stuff. dvo_port_to_port() doesn't know about DSI so we won't get into any kind of "is port B HDMI or DSI or both?" conundrum, which could otherwise happen on VLV/CHV due to DSI ports living in a separate world from the other digital ports. Including Jani's detailed analysis here for posterity: "We stop checking for port A for CHV in intel_bios_is_port_present(), but it's a warn and I don't recall any bug reports, so probably fine. We could add a check in parse_ddi_port(), but meh. Ditto for intel_bios_is_port_dp_dual_mode(), except it doesn't have a warn. The eDP check in intel_bios_is_port_edp() becomes slightly more relaxed. Both the old and new check require these to be set: - DEVICE_TYPE_DISPLAYPORT_OUTPUT - DEVICE_TYPE_INTERNAL_CONNECTOR. The old code also required these to be unset: - DEVICE_TYPE_MIPI_OUTPUT - DEVICE_TYPE_COMPOSITE_OUTPUT - DEVICE_TYPE_DUAL_CHANNEL - DEVICE_TYPE_LVDS_SIGNALING - DEVICE_TYPE_TMDS_DVI_SIGNALING - DEVICE_TYPE_VIDEO_SIGNALING - DEVICE_TYPE_ANALOG_OUTPUT It's possible we've added these just as a sanity check for broken VBTs more than anything. I guess I'd see if actual problems arise. Bottom line, I think the functional changes matter only for VBTs with bogus data." I agree that it should work assuming the VBT isn't totally insane. Modern windows drivers also don't seem to check any of those additional device type bits, which may or may not matter for older devices (no idea what some old driver versions are checking). Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211217155403.31477-3-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula <jani.nikula@intel.com> |
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| kernel | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.